Shaving machine for a crank pin

ABSTRACT

A portable shaving machine to rectify distortion and wear and tear of a crank pin and the like comprises a circular casing containing within it a worm rotated by a motor and a worm wheel which engages said worm, a circular rotor arranged in said worm wheel by means of a link and which has a shaving blade and a number of chucks which are arranged to draw the shaving blade to a crank pin, and a supporting frame to fix the casing. It can repair a distorted crank pin very simply without disassembling an engine to remove a deformed crank pin, which is particularly advantageous in case of a crank pin of the engine in a ship.

. [22] Filed United States Patent [72] Inventors {45] Patented [32]Priority June 20, 1968 1 J p [31] 43/4313! [54] SHAVING MACHINE FOR ACRANK PIN 10 Claims, 8 Drawing Figs.

[52] US. Cl 82/4 B [51] lnt.Cl B23!) 5/16 [50] Field of Search i 1 i82/4, 4.2 9

Primary Examiner-Leonidas Vlachos AltomeyDawson, Tilton, Fallon andLungmus ABSTRACT: A portable shaving machine to rectify distortion andwear and tear of a crank pin and the like comprises a circular casingcontaining within it a worm rotated by a motor and a worm wheel whichengages said worm, a circular rotor arranged in said worm wheel by meansof a link and which has a shaving blade and a number of chucks which arearranged to draw the shaving blade to a crank pin, and a supportingframe to fix the casing. It can repair a distorted crank pin very simplywithout disassembling an engine to remove a deformed crank pin, which isparticularly advantageous in case of a crank pin ofthe engine in a ship.

PATENTEB JUN29 |97l SHEET 1 BF 2 FIG] FIG.5

FIG.4

PATENTED JUN29 IBTi SHEET 2 BF 2' F/GZ SIIAVING MACHINE F011 A CRANK PMThe present invention relates to a shaving machine of a crank pin, moreparticularly, a portable shaving machine to rectify distortion andrepair wear and tear of a crank pin.

A crank pin in an engine will be gradually worn out with use, becausethe same place of a crank pin will be constantly subject to a shock ofexplosion of the engine through the intermediary ofa connecting rod, sothat the crank pin will be worn out and distorted so as to become ovalin cross section. As a result, a gap will be made in the joint between acrank pin and a connecting rod and there is an apprehension of seizurebetween a piston and a cylinder, because of an unsatisfactory oiling forthe piston. Besides, the heat generated on that occasion is conducted tothe connecting rod and the crank, entailing a scaling loss in theconnecting rod or the crank. Furthermore, saidjoint becomes loose, whichresults in a break in the metal. Consequently, whenever a distortion andwear and tear exceed 0.1 mm., the crank pin must be repaired.

However, a conventional shaving machine of a crank pin is so constructedthat the crank has to be removed from the engine in order to carry out arepairing work. For that reason, it has been necessary that, in order toshave a crank pin, the engine is disassembled and the crank has beenconveyed to a repair shop equipped with a shaving machine, whichrequires a great deal of labor and a wasteful time of transportationinto the bargain.

One of the objects of the present invention is to provide a simpleshaving machine which can repair a crank pin to become completely roundin cross section without removing it from an engine.

In short, the shaving machine of a crank pin according to the presentinvention comprises a circular casing containing within it a worm to bedriven to rotate by means of an electric motor and a worm wheel whichengages said worm, a circular rotor which is arranged in said worm wheelby means of a link which can freely swing, and which is provided in itsinner circumference with a single shaving blade and a required number ofchucks arranged so as to draw the shaving blade to the crank pin, and asupporting frame to firmly fix the casing, while all the worm wheel, thecasing and the rotor can be opened in two parts respectively, and thetransfer of the chucks and the shaving blade towards a center of therotor can be freely adjusted, if required.

All the other characteristics, objects and advantages of the presentinvention will be clearly understood by reference to the attacheddrawings and from the following detailed description of its examples,wherein:

FIG. 1 is an elevation of a partly notched new shaving machine of thecrank pin according to the invention.

FIG. 2 is a side view of a partly notched example shown in FIG. 1.

FIG. 3 is a section taken along line 3-3 of the example shown in FIG. 1.

FIG. 4 is an enlarged oblique view of a snap for a fixed chuck or ashaving blade.

FIG. Sis an oblique view of snap for a pressing chuck.

FIG. 6 is an enlarged section of FIG. 1 taken along line 6-6, and

FIG. 7 and FIG. 8 are diagrammatic explanatory view.

The shaving machine shown in FIGS. 1, and 2 and 3 is a desirous exampleof the present invention and it includes a circular worm wheel casing 5which has a cylindrical worm casing at its head and the cross section ofwhich is V-shaped. The worm wheel casing 5 consists of two semicircularsections 5a and 5b, both of which are mutually combined by means of ahinge 6 at their respective one ends, while at their ends arerespectively provided the outside lugs 7 and 8 with a tapped hole 9which is common to both of them. After these lugs 7 and 8 are combined,the bolt 10 is screwed into the tapped hole 9 to form a circular. Intothe casing 5 is inserted a circular worm wheel 2 which is provided witha flange 4 on its inner circumference, while said worm wheel 2 isseparable into two semicircular sections 2a and 2b and their joint 3 issimply put together, but not combined. Into the casing 11 is inserted aworm I which is engaged with the worm wheel 2 and one 15a of its shaft15 is received into a cover-shaped bearing 13 screwed into one openingof the casing 11 between the bearing of a worm shaft and the worm 1 bymeans ofa thrust bearing 16, and the other end 151) of the shaft 15 isprojected long out of a barrel-shaped bearing 12 which is screwed intothe other opening of the casing 11 between the bearing of a worm shaftand the worm 1 by means of a thrust bearing 14. It is combined with aflexible shaft, although not illustrated, and further connected to themotor, so that worm 1 may be driven by it.

Inside the worm wheel 2 is arranged a circular rotor 17 at a certaininterval. It also consists of two semicircular sections 17a and 17!),both of which are mutually combined by a hinge 18 at their respectiveone ends, while at the other ends of the semicircular sections 17a and17b are provided the outside lugs 19 and 20 with a tapped hole 21 whichis common to both of them. After these outside lugs 19 and 20 are puttogether, the bolt 22 is screwed into the tapped hole 21 to form acircular. The inside lug 24 provided in the worm wheel 2 and the outsidelug 25 made in the rotor 17 are gently fixed into the respective ends ofa H-shaped link 23, and, with the aid of a pin 26, they are combined tofreely swing. Inside the rotor 17 are respectively arranged two fixedchucks 27 and 28 and the pressing chucks 29 and 30, all of which arerod-shaped. The fixed chucks 27 and 28 make a right angle with eachother facing toward the center of the rotor 1'7, while the pressingchucks 29 and 30 likewise make a right angle with each other facingtoward the center of the rotor 17. In other words, the fixed chuck 27and the pressing chuck 30 on the one hand and the fixed chuck 28 and thepressing chuck 29 on the other are oppositely facing each otherrespectively. Between the pressing chucks 29 and 30 is arranged theshaving blade 31 making an angle of 45 and it is slightly longer thanall the chucks 27 to 30 and is directed toward the center of the rotor17. The shaving blade 31 is inserted into a shaving blade holder 32which is U-shaped in cross section and which is fixed by a setscrew 33put through it from its one side to the other, while from the bottom ofsaid holder 32 is also put through an adjust screw 34, by means of whichthe projection of the edge of said shaving blade 31 can be freelyadjusted. To the pressing chucks 29 and 30 are provided legs 35 squarelyshaped in cross section and making a right angle respectively, while tothe fixed chucks 27 and 28 and the shaving blade holder 32 are alsoarranged the legs 36 shaped squarely in cross section and making a rightangle respectively, but their thickness is made slightly thinner thanthe legs 35. To the rotor 17 are made five grooves which have stepsections 38 on their lateral sides and which are directed toward thecenter of the rotor 17, while the legs 35 and 36 are fixed into theabovementioned places respectively. Into the tapped hole 40 made in thebottom part of the legs 35 and 36 are screwed the adjust screws 39respectively and round washers 41 are loosely fixed onto them so as tobe caught by their heads 42 respectively.

As clearly seen by FIGS. 4 and 5, both the snap 43 for the pressingchuck and the snap for the fixed chuck and the shaving blade areL-shaped in cross section and their rectangular bent sections 43a and44a are provided with a notched section 45, into which can be insertedthe head 42 of a adjust screw 39, but, to the snap 44 are arranged inits inner side the projecting stripes 46 which can be fixed into theentrance section of the groove 37 and this face accounts for itsdifference from the aforesaid snap 43. The snaps 43 and 44 arerespectively put on the step sections on both sides of the groove 37 andtheir bent sections 43a and 44a are placed over the rotor 17 from itsoutside at a certain interval by means of a washer 41 and fixed by thebolt 47, but the washer 43 is fixed in such a way that it does not pressdown the legs 35, while the press chucks 29 and 30 can move in thegroove 37 in the direction of a center of the rotor 17. On the otherhand, the snap 44 presses down the leg 36 by means of its projectingstripe 46 and, after adjusting the chucks 2'7 and 28 and the shavingblade 31 by means of the adjust screw 39, it can be fixed to apredetermined position. Between the respective chucks 29 and and theinside of the rotor 17 is interposed a coil spring 48 to constantlypress the chucks 29 and 30 toward the direction of a center of the rotor17. The fixed supporting frame 49 of a pair of casings, which are madeto oppositely face with each other at a certain interval, consist of twosymmetrical almost L-shaped sections 49a and 49b, both of which arecombined by means of a hinge 50 so as to be opened outward. To the upperend of the respective supporting frame 49, the lower screw rod support51 is arranged so as to be in a body and it is connected to the upperscrew rod support 52 by means of a hinge 53 so as to be opened upward,while on the sides of both screw rod supports 52 and 53 are providedlongitudinal grooves 54, into which is inserted the bolt 55 from belowand onto said bolt 55 is fixed a butterfly nut 56 from above, so that itcan press down and catch the upper screw rod support 52. Over the frontand rear screw rod supports 54 are laid two feed screw rods 57 inparallel which have a screw ditch made semicircular in cross section,and they are put into cylindrical sections 58 on both sides ofa wormwheel casing 5. into the cylindrical section 58 is screwed a bolt 58 andits tip is inserted into the screw ditch of a screw rod 57 so as toallow the screw rod 57 to rotate. Between the lower ends of the frontand rear supporting frames 49 is inserted a jack which has an operationhandle 62 in the center and steps 61 at both ends. The steps 61 can bemade to go in and out by turning a central handle 62.

The shaving machine according to the present invention can be used inthe following way: in order to shave and rectify a crank pin P arrangedin an engine, the shaving machine is first disassembled entirely andthen it is arranged and assembled on the crank pin P. For that purpose,the rotor 17 is divided into semicircular sections 17:: and 17b with ahinge 18 as a fulcrum and it is opened to be put over a crank pin P,while respective outside lugs 19 and 20 are connected by means of a bolt22. On that occasion, the shaving blade 31 and the pressing chucks 29and 30 are drawn in first and, after inserting the rotor 17, the adjustscrew 39 is turned to push inward the pressing chucks 29 and 30 and thecrank pin P is lightly tightened. After arranging in this way, a gaugehaving a hexangle shape in cross section is placed on the rotor 17 andthen, the worm wheel 2, which is divided into the semicircular sections2a and 21.1 by dividing the worm wheel casing 5, with a hinge 6 as afulcrum, into the semicircular sections 50 and b, is restored and, afterlaying all these sections over the rotor 17 from outside, the outsidelugs 6 and 7 are screwed down by a bolt 9. Besides, a required number ofgauges is inserted, at a suitable interval, between the rotor 17 and theworm wheel casing 5, and a link 23 is respectively connected by a pin 26to all the lugs 24 and. 25 of the worm wheel 2 and the rotor 17. Afterthen, two feed screw rods 57 are put into the cylindrical sections 5 onboth sides of the casing 5 and their both ends are once received on alower rod supports 51. The jack 60 is then used to press a pair f thesupporting frames 49 to the surfaces of crank arms A on both sides andfix them, while a upper rod supports 52 are closed and tightened by abolt 55 and a butterfly nut 56. After then, the gauge is removed and theworm shaft is connected to the motor arranged outside the engine bymeans of a, flexible shaft.

Both the worm wheel 3 and the rotor 17 are circular, but the latter ismade to be free within the former and, since the chucks 27 to 30arranged in the rotor 17 and the shaving blade 31 can be put to thecrank pin P as a main body, a centering can be made easily and withoutfail. If the rotor 17 is fixed to the worm wheel 2 and cannot beshifted, the rotor 17 will be pulled to one side and centering cannot bemade exactly, when the casing 5 is not supported rightly. in fact, sincefixing is carried out in a narrow crank ase, it is difficult to correcly support and fix the casing 5.

As soon as the abovc=rnentioned fixing is completed, the crank pin Pwill be shaved in the following way: the rotation of a worm i istransmitted to the rotor 17 through the intermediary of the worm wheel 2and the link 23 and, as shown by an arrow mark in FIG. 1, the rotor 17will rotate clockwise. However, the rotor 17 is first rotated two orthree times, while drawing in the shaving blade 31, so that the tensiontest of a spring 48 of the pressing chucks 29 and 30 is made to keep itappropriate by the adjust screw 39. The shaving blade 31 is then pushedout inward by means of the adjust screw and fixed just this side of thepoint where the shaving blade 31 hits against the crank pin P. On thatoccasion, the shaving blade 31 will be so positioned that it can shavethe pin P from its deformed convex section or not yet abraded section x(See P16. 7). After arranging in this way, the rotor 17 is made torotate and its appropriate speed of revolution is 450 to 500 rpm. Thepressing chucks 29 and 30 advances and retreats in correspondence to adistortion of the crank pin P to the extent of a gap between the rotor17 and a bent section 43a of a snap 43. However since the tension of aspring 48 is constantly at work, the fixed chucks 27 and 28 are drawn tothe crank pin P. Consequently the shaving blade 31 is forced to pressagainst the crank pin P. As a result, when the rotor 17 is turnedclockwise and the shaving blade 31 comes to a deformed convex section x,it will shave that section as shown by FIG. 8. But, there are gaps inother sections. if the shaving blade 31 is gradually pushed out, thedeformed convex section x will be shaved by degrees. When there will beno gap in any point between the shaving blade 31 and the crank pin P,the rotor 17 will be stopped. At this point, the circular arc of a crankpin P will show the same curvature everywhere and it becomes a completeround.

When the length of the crank pin P and that of the shaving blade 31 arethe same, shaving can be made completely. But if the crank pin P islonger than that of the shaving blade 31, the feed screw rod 57 will beturned to make the worm wheel casing 5 to be screwed forward and shavingwill be carried out repeatedly in a manner as mentioned above. As shownin FIG. 3, the shaving blade 31 is longer than the chucks 27 to 30 by adistance L in the turning direction of the rotor 17 shown by an arrowmark in FIG. 3. Therefore, the chucks 27 to 30 will move in an arrowdirection along the circumference of the chucks 27-30 which are shavedby the shaving blade 31 to become a complete round, so that a rectifyingshaving can be carried out with no change in the axial center of thecrank pin P. Needless to mention, the shaving blade 31 is drawn in onthis occasion. Besides, although the feed screw rod 57 is turnedmanually by catching the head at its end by a monkey spanner, it can berotated automatically, if desirable.

in the above-mentioned example of the invention, the fixed chucks 27 and28 on the one hand and the pressing chucks 29 and 30 on the other handare arranged on the rotor 17 to make a right angle with each other,while the shaving blade 31 is also arranged to make an angle of 45 withthe pressing chucks 29 and 30 respectively. But, such an arrangement isnothing but an example, and there can be various arrangements. inaddition, there are cases where neither a pressing chuck nor a fixedchuck is required.

The shaving machine according to the present invention is portable, andthe crank pin can be repaired, while the crank remains fixed to anengine, which is particularly advantageous in case of ships. in otherwords, when a distortion is found in the crank pin of a conventionalengine, it has been necessary to bring a ship to a dock or a repairingwharf to disassemble the engine and to break a part of the hull to fetchthe crank pin to a land factory, in contrast to which, the shavingmachine according to the invention can be attached to the crank pin byopening a crank case window in order to shave and rectify the crank pin.As a result, the crank pin can be repaired very simply when a ship is ata cargo working or waiting offshore.

Besides, the shaving machine according to the present invention can beutilized when shaving not only the crank pin of an engine, but also allkinds of crank pins inclusive of compressors as well as peripheries ofsharts and pipes etc.

What we claim is:

l. A shaving machine for a crank pin comprising a circular casing, aworm rotatably mounted within the casing, a worm wheel within the casingengaging the worm, a circular rotor within the worm wheel, link meansconnecting the rotor and the worm wheel,,a shaving blade mounted on therotor, and a plurality of chucks mounted on the rotor and arranged tourge the shaving blade toward the crank pin, each of the worm wheel,casing, and rotor being formed in two sections to permit openingthereof.

2. The shaving machine of claim 1 wherein the chucks in clude two fixedchucks and two pressing chucks provided with a spring, each of thechucks being arranged on the inner circumference of the rotor andextending toward the center of the rotor, the chucks being spaced apartabout 90 along the circumference of the rotor, the shaving bladeextending between the two pressing chucks.

3. The shaving machine of claim 1 including a supporting frame for thecircular casing, the supporting frame being formed in two sections topermit opening thereof.

4. The shaving machine of claim 1 in which each of the cas ing and rotorare formed from a pair of semicircular sections which are hingedlysecured.

5. A shaving machine for a crank pin comprising a circular casing, aworm rotatably mounted within the casing, a worm wheel within the casingengaging the worm, a circular rotor within the worm wheel and pivotallyconnected to the worm wheel by a link which can swing freely, a shavingblade ad justably mounted on the rotor and extending inwardly beyond theinner circumference of the rotor, a plurality of chucks adjustablymounted on the rotor and extending inwardly beyond the innercircumference of the rotor and arranged to draw the shaving blade towardthe crank pin, the shaving blade extending inwardly beyond the chucks, asupport frame supporting the casing, and transferring means for movingthe casing axially with respect to the crank pin, each of the wormwheel, casing and rotor being formed of two parts to permit openingthereof.

6. The shaving machine of claim 5 wherein the transferring meanscomprises a rotary screw rod threadedly engaged with the casing androtatably supported by the frame.

7. The shaving machine of claim 6 including a bolt secured to the casingand extending between threads of the screw rod to providethe threadedengagement between the screw rod and the casing.

8. The shaving machine of claim 5 wherein the supporting frame includesa pair of spaced-apart frame portions, the cats ing being positionedbetween the frame portions, and jack means extending between the frameportions for forcing the frame portions away from each other.

97 A shaving machine for a crank pin comprising a circular casing, aworm rotatably mounted within the casing, a worm wheel within the casingengaging the worm, a circular rotor, link means connecting the rotor andthe worm wheel, a shaving blade mounted on the rotor, a plurality ofchucks mounted on the rotor and arranged to draw the shaving bladetoward the crank pin, a pair of spaced-apart supporting frames, thecasing being supported between the frames, transferring means mounted onthe frames and engaging the casing for moving the casing toward and awayfrom the supporting frames, and a jack extending between the supportingframes for moving the supporting frames away from each other.

10. A shaving machine for a crank pin comprising a circular casingwithin which are supported a worm adapted to be rotatably driven by anelectric motor, a. worm wheel which cngages the worm, a circular rotorconnected to the worm wheel by an elongated link, one end of the linkbeing pivotally secured to the worm wheel and the other end of the linkbeing pivotally secured to the worm wheel and the other end of the linkbeing pivotally secured to the rotor, a pair of pressing chucks mountedon the rotor for radial movement, a spring on each of the pressingchucks for urging the chucks radially inwardly with respect to therotor, a shaving blade mounted on the rotor equidistant between thepressin chucks, a fixed chuck mounted on the rotor opposite eac of thepressing chucks, a pair of supporting frames supporting the casingtherebetween, a feed screw rod extending between the supporting framesand engaging the casing for moving the casing toward and away from thesupporting frames, ajack extending between the supporting frames, eachof the worm wheel, cas ing and rotor being formed by a pair of generallysemicircular portions to permit opening thereof, the semicircularportions of the casing and rotor being hingedly secured.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,589,217 Dated J ne 29, 1971 Inventor(s) Masaaki Kobayashi and TetujiroKobayashi It is certified that error appears in the above-identifiedpatent and that said Letters Patent are hereby corrected as shown below:

In claim 10, lines 26 and 27, please delete "and the other end of thelink being pivotally secured to the worm wheel" Signed and sea led this23rd day of November 1971 (SEAL) Attest:

ROBERT GOTTSCHALK EDWARD M.FLETCHER,JR.

Acting Commissioner of Patents Attesting Officer FORM PO-IOSO (10-69)USCOMM DC 603764;; a u s sovznnmem rnumuc OFFICE I969 o-asu-au

1. A shaving machine for a crank pin comprising a circular casing, aworm rotatably mounted within the casing, a worm wheel within the casingengaging the worm, a circular rotor within the worm wheel, link meansconnecting the rotor and the worm wheel, a shaving blade mounted on therotor, and a plurality of chucks mounted on the rotor and arranged tourge the shaving blade toward the crank pin, each of the worm wheel,casing, and rotor being formed in two sections to permit openingthereof.
 2. The shaving machine of claim 1 wherein the chucks includetwo fixed chucks and two pressing chucks provided with a spring, each ofthe chucks being arranged on the inner circumference of the rotor andextending toward the center of the rotor, the chucks being spaced apartabout 90* along the circumference of the rotor, the shaving bladeextending between the two pressing chucks.
 3. The shaving machine ofclaim 1 including a supporting frame for the circular casing, thesupporting frame being formed in two sections to permit opening thereof.4. The shaving machine of claim 1 in which each of the casing and rotorare formed from a pair of semicircular sections which are hingedlysecured.
 5. A shaving machine for a crank pin comprising a circularcasing, a worm rotatably mounted within the casing, a worm wheel withinthe casing engaging the worm, a circular rotor within the worm wheel andpivotally connected to the worM wheel by a link which can swing freely,a shaving blade adjustably mounted on the rotor and extending inwardlybeyond the inner circumference of the rotor, a plurality of chucksadjustably mounted on the rotor and extending inwardly beyond the innercircumference of the rotor and arranged to draw the shaving blade towardthe crank pin, the shaving blade extending inwardly beyond the chucks, asupport frame supporting the casing, and transferring means for movingthe casing axially with respect to the crank pin, each of the wormwheel, casing and rotor being formed of two parts to permit openingthereof.
 6. The shaving machine of claim 5 wherein the transferringmeans comprises a rotary screw rod threadedly engaged with the casingand rotatably supported by the frame.
 7. The shaving machine of claim 6including a bolt secured to the casing and extending between threads ofthe screw rod to provide the threaded engagement between the screw rodand the casing.
 8. The shaving machine of claim 5 wherein the supportingframe includes a pair of spaced-apart frame portions, the casing beingpositioned between the frame portions, and jack means extending betweenthe frame portions for forcing the frame portions away from each other.9. A shaving machine for a crank pin comprising a circular casing, aworm rotatably mounted within the casing, a worm wheel within the casingengaging the worm, a circular rotor, link means connecting the rotor andthe worm wheel, a shaving blade mounted on the rotor, a plurality ofchucks mounted on the rotor and arranged to draw the shaving bladetoward the crank pin, a pair of spaced-apart supporting frames, thecasing being supported between the frames, transferring means mounted onthe frames and engaging the casing for moving the casing toward and awayfrom the supporting frames, and a jack extending between the supportingframes for moving the supporting frames away from each other.
 10. Ashaving machine for a crank pin comprising a circular casing withinwhich are supported a worm adapted to be rotatably driven by an electricmotor, a worm wheel which engages the worm, a circular rotor connectedto the worm wheel by an elongated link, one end of the link beingpivotally secured to the worm wheel and the other end of the link beingpivotally secured to the worm wheel and the other end of the link beingpivotally secured to the rotor, a pair of pressing chucks mounted on therotor for radial movement, a spring on each of the pressing chucks forurging the chucks radially inwardly with respect to the rotor, a shavingblade mounted on the rotor equidistant between the pressing chucks, afixed chuck mounted on the rotor opposite each of the pressing chucks, apair of supporting frames supporting the casing therebetween, a feedscrew rod extending between the supporting frames and engaging thecasing for moving the casing toward and away from the supporting frames,a jack extending between the supporting frames, each of the worm wheel,casing and rotor being formed by a pair of generally semicircularportions to permit opening thereof, the semicircular portions of thecasing and rotor being hingedly secured.